简答题 翻译：The gas saturation is obtained in the same manner as the retort.

问答题翻译：These reservoirs can be classified according to rock types, depending on variations in source rock, transport distance, and depositional environment.

问答题翻译：Classification of traps logically falls into three broad general groups: (1) structural, (2)stratigraphic, and (3)combination.

问答题翻译：The retort method has several disadvantages as far as commercial work is concerned.

问答题翻译：Conditions of viscous flow mean that the rate of flow will be sufficiently low to be directly proportinal to the potential gradient.

问答题翻译：The data for subsurface maps are obtained from a number of sources.